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Self-tapping in bolts, self-drilling thread geometry

Update:06 Nov 2017
Summary:

(A), large diameter / tooth diameter (d1), for the imag […]

(A), large diameter / tooth diameter (d1), for the imaginary cylindrical diameter of the thread crest coincidence. Thread diameter basically represents the nominal diameter of the thread size.
(B), Trail / root diameter (d2): the imaginary cylindrical diameter coincides with the thread bottom.
(C), pitch (p): the adjacent teeth in the meridians corresponding to the two axial distance. Teeth pitch is indicated in inches per inch (25.4mm).
The following table lists the common specifications of the tooth pitch (metric) number of teeth (English)
1, metric tapping teeth:
Specifications: ST 1.5, S T1.9, S T2.2, S T2.6, S T2.9, S T3.3, S T3.5, S T3.9, S T4.2, S T4.8, S T5.5, S T6.3, S T8.0, S T9.5
Teeth distance: 0.5,0.6,0.8,0.9,1.1,1.3,1.3,1.3,1.4,1.6,1.8, 1.8,2.1,2.1
2, English self-tapping teeth:
Specifications: 4 #, 5 #, 6 #, 7 #, 8 #, 10 #, 12 #, 14 #
Number of teeth: AB teeth 24,20,20,19,18,16,14,14
A Tooth 24, 20, 18, 16, 15, 12, 11,

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